Safety cut-off for water-gages.



N0. 652,795. Patented luly 3, |900.

P. J. MAGDONALD.

S`AFET Y CUT-OFF FOR WATER GAGES.

(Application filed Oct. 2B, 1899.)

(N0 Model.)

man

. I @mib/Leona i' Mac'onald,

UNITED STATES Trice.

PATENT SAFETY CUT-OFF FOR WATER-GAGES.

SPECIFICATION forming part of Letters Patent N o. 652,795, dated July 3,1900. Application filed October 28,1899, Serial No. 735,081. (No model.)

To @ZZ w/"tom it may concern: y Be it known that I, PARISH JOHN MACDONALD, a subject of the Queen of Great Britain,

residing at Zacatecas, in the Republie'of Mexhave not been fullysatisfactory; and the object of my invention is to provide a cheap,

strong, and reliable automatic cut-o.

My invention consists of certain details of f construction andcombination of parts,which will be hereinafter fully described, setforth in the claims, and illustrated in the drawings, forming a parthereof, and in which- Figure 1 is a view in side elevation of awater-gage constructed in accordance with my invention, thegravity-levers being shown as raised, the central portion of themechanism being broken out to shorten the gure, and the water and steamcolumn being partly illustrated. Fig. 2 is a sectional view on thevertical plane indicated by the broken line 2 2 of Fig. 1 looking to theright, as indicated by the arrow, the gravity-levers, glass, and upperpacking-head thereof being shown in elevation. Fig. 3 is a view inelevation, on an enlarged scale, of the lower end of the gage, showin gthe water-cock with the gravity-lever held up in the position itoccupies while steaming up the boiler. Y l Y Like parts are designatedbythe samenu'- inerals wherever they appear in the several figures ofthe drawings.

Referring to the drawings by numerals, 5 indicates the water-column of asteam-boiler of ordinary construction, from which extend the steam-pipe6 and water-pipe 7 to the castings 8 and 9, in which the gage-glass 10is secured. Upon the casting 8 is formed or secured a cylinder 11 atright angles to the glass and to the pipes 6 and 7, and a pipe or tube12, opening at its lower end in the glass, leads through the upper endof the casting 9 into the inner end of cylinder 11. In the cylinder .1Sand 19.

is a piston 13, having its piston-rod 14 extending through the outer endof the cylinder,

4thepistonhead and rod bein g properly packed,

if deerned necessary, and a spring 15 being coiled around the piston-rodand normally j forcing the piston to the inner end of the cylinder.

16 andv17 indicate butterfly-valves or any other suitable form of valvesor cocks in the steam and water pipes 6 and 7, respectively, said valvesbeing provided with stems or plugs I Each plug is provided with asuitable packing-nut, as at 20, and on the lower valve 17, under thepacking-nut, is a washer 2l, into one side'of which is threaded ahorizontal bar 22, having a piece 24 hinged to its Youter end with aknife-point, as at 25, and

provided with a spring 26.

' Parallel gravity-levers 27 and 28 are secured to the stems 18 and 19,connected together by a link 29, the upper lever being provided with anotch 30 in its lower edge to rest over `the end of the piston-rod 14when forced outward.

In the end of the cylinder 11 is a blow-od cock 31, of any ordinaryconstruction, and for its usual purpose of cleaning out sediment ofvarious kinds to keep the cylinder clean and the piston in good Workingcondition.

When the levers 27 and 28 are raised, the valves 16 and 17 are open, andwhen lowered the valves are closed.

When getting up steam, it is necessary to have the valves open, so thatduring this operation the levers are raised and the piece 24 turned upinto a vertical position, as in Fig. 3, holding up the levers. As soonas sufeient steam is generated to press the pistonhead 13 outwardagainst the pressure of the spring 15 the piston-rod 14 will beprojected IOO close the valves, thereby immediately cutting,r o thesteam from the gage.

The weight of the levers will be suiicient to close the valves; but thismay be reinforced by a spring, if desired.

Having thus fully described my invention, what I claim as new, anddesire to obtain by Letters Patent of the United States, is-

1. The combination with the water-gage glass, of a steam-boiler providedwith steam and water cocks, of a gravity-lever secured to the stem ofone of the cocks in position, when raised, to hold the steam-cock openand when lowered, to close it, a stop to hold the lever raised and heldin position by the steampressure in the gage-glass, and means whereby acontinuously-operated force is applied to withdraw the stop when thepressure is lessened or dissipated, substantially as described.

2. rlhe combination with the watergage glass, of a steam-boiler providedwith steam and water cocks, of a gravity-lever secured to the stem ofone of the cocks in position, when raised, to hold the steam-cock openand when lowered, to close it, a stop to hold the lever raised and saidstop being held in position by the steam-pressure in the gage-glass, anda spring acting upon the stop in the opposite direction to withdraw itand permit it to fall and close the cock when the steam-pressure islessened or cutolI", substantially as described.

3. The combination with a water-gage glass, of a steam-boiler providedwith the usual steam and water cocks, of gravity-levers secured to thestems of the cocks, a link connecting the levers, a stop held in thepath of one of the levers by the pressure of steam in the gage-glass,and means whereby a continuous force is exerted upon the stop towithdraw it from under the lever when the pressure is cut off,substantially as described.

4. The combination with a water-gage glass of a steam-boiler providedwith the usual steam and water cocks, of gravity-levers secured to thestems of the cocks, a link connecting the levers, a stop held in thepath of one of the levers by the pressure of steam in the gage-glass,and a spring whereby a continuous force is exerted upon the stop towithdraw it from under the lever when the pressure is cut off,substantially as described.

5. The combination with the watergage glass of a steam-boiler, and theusual steam and water cocks, of a gravity-lever on the stem of one ofthe cocks arranged tohold the cock open when raised and closed when low-1 ered, a cylinder, a piston-head therein forced in one direction by thepressure of the steam in the gage-glass into the path of thegravitylever to hold it raised and a spring arranged to force the pistonin the opposite direction, out of the path of the lever when thesteampressure is removed, to permit the levers to fall and close thecocks, substantially as described.

6. The combination with a water-gage glass of a steam-boiler providedwith the usual steam and water cocks, a link connecting the levers, astop held in the path of the lever by the pressure of steam in thegage-glass, a spring exerting a continuous force against the stop toremove it from the path ofthe levers when the pressure is removed, and astop manually operable to hold the levers up while steaming up,substantially as described.

PARISH JOHN MACDONALD.

Witnesses:

IGNACIO FLORES, MANUEL ORTIZ GALLARDO.

